[WAM] Re-work WebApp loading in WAM to use the surfaces list
Description
As we're going to get (in the render) process a list of potential surfaces defining the way the client shell works, need to modify the WebAppManager core to go over all of them.
Minor
As we're going to get (in the render) process a list of potential surfaces defining the way the client shell works, need to modify the WebAppManager core to go over all of them.